#include <stdio.h>
#include<string.h>
#include<assert.h>
size_t my_strlen(const char* str) {
	assert(str != NULL);
	int count=0;
	while (*str != '\0') {
		count++;
		str++;
	}
	return count;
}
int main() {
    char arr[] = "abcdef";
	int ret = my_strlen(arr);
	printf("%d\n", ret);
	return 0;
}
